163215640 has 96 divisors (see below), whose sum is σ = 446058720. Its totient is φ = 52641792.

The previous prime is 163215593. The next prime is 163215677. The reversal of 163215640 is 46512361.

163215640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 163215599 and 163215608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79912 + ... + 81928.

It is an arithmetic number, because the mean of its divisors is an integer number (4646445).

Almost surely, 2^163215640 is an apocalyptic number.

163215640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163215640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223029360).

163215640 is an abundant number, since it is smaller than the sum of its proper divisors (282843080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163215640 is a wasteful number, since it uses less digits than its factorization.

163215640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069 (or 2048 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 163215640 is about 12775.5876577166. The cubic root of 163215640 is about 546.4963396256.

The spelling of 163215640 in words is "one hundred sixty-three million, two hundred fifteen thousand, six hundred forty".